Caster raising and lowering device for stands for type-writing machines, &amp;c.



HIGH 2 WITNEMSI I IN VaENIOR:

A. G. P. KUROWSKI. CASTER RAISING AND LOWERING DEVICE FOR STANDS FOR TYPE WRITING MACHINES, 6w. APPLICATION FILED MAY 29, 1911.

1 ,@82, 1 0- Patented Dec. 23, I913.

ATTORNEY lid UNITED s'rArEs PATENT OFFICE.

ALFRED G. F. KUBOWSKI, OF NEW YORK, N. Y., A SBIG'NOR TO UNDEBWOOD TYPE- WBITER COMPANY, OF NEW YORK, N. Y., A CORPORATION 01? DELAWARE.

CASTER RAISING AND LOWERING DEVICE FOR STANDS FOR TYPE-WRITING MACHINES, 85o.

Specification of Letters Patent.

Patented Dec. 23, 1913.

To all whom it may concern:

Be it known that I, ALFRED G. F. Kunow- SKI, a citizen of the United States, residing in Brookl n borough, New York city, in the county of Kings and State of New York, have invented certain new and useful Improvements in Caster Raising and Lowering Devices for Stands for Type-Writing Machines, &c., of which the following is a specification.

This invention relates to caster raising and lowering devices for stands or tables for typewriting or similar machines. Such tables are usually mounted on casters or wheels, and when the machine is operated the table has atendency to vibrate and shift its position on the floor.

One of the principal objects of my invention is to provide improved and eflective means for holding the table against such movement.

According to this invention, the legs or supports bear directly on the floor when the typewriter is in use, so as to avoid shifting about of the stand. Wheels are fixed at one side of the table on the outer sides of said supports, with their peripheries clearing (or just touching) the floor, but not hearing much if any of the weight of the table.

An auxiliary leg, having a caster, and capable of being extended, is provided at the opposite side of the table. By means of a lifting lever, downward pressure is exerted against this leg, and the entire table is raised and tilted, so that its weight is borne by said wheels and by the caster of the extended auxiliary leg; whereby the table may be readily run along the floor. Upon returning said levers, the table drops to normal position. To overcome the jolt when the table is thus restored, a dash pot is interposed between said leg and the table, to cushion or retard its drop.

Other objects and advantages will hereinafter appear.

1n the accompanying drawings, Figure 1 is a general perspective view of the improvements: Fig. 2 shows the raising device when the table is in normal position, with the dash pot in section. Fig. 3 shows the same device when the table is raised. Fig. 4 is an en :lar'ged view of the dash-pot partially broken :away.

The stand illustrated has an iron frame. with the usual top 1, supports or legs 2, and braces 3. Wheels 4 are fixed at one side of the table, and are normally disposed to clear the floor. 1 I

An auxiliary leg 5 is mounted in a guide 6, provided on brace 7, and is capable of extending or moving vertically w1t-h relation to the adjacent supports 2. A link 8 is fastened pivotally to leg 5st 9, and to a .lever 10 at 11, which'is fixed on a rock shaft 12, mounted on supports 2 by brackets 13; and a hand lever 14 is fixed to the rock shaft 12. Said levers and link are normally disposed as shown in Fi 2, the wheel or caster 15 resting idly on t e floor. l The hand lever 14 may be forced upward to the position shown in Fig. 3, which, presses link 8 downward, forcing the leg 15 against the floor, whereby the adjacent supports 2 are raised and the table tilted about the axis of wheels 4, suiiiciently for the opposite supports to clear the floor, so that all wheels are thereby brought into use for supporting the table. The link 8 abuts against a member such as cylinder 16, to prevent further upward movement of lever 14, and to lock and maintain the table in raised position. To restore the table, lever 14 is returned to-the position in Fig. 2.

In order that the table should not drop abruptly and shake the machine thereon, a

dash pot shown as a pneumatic cylinder 16 is fixed to brace 17, and a piston 18 at the upper end of leg 5 cooperates therewith to retard the drop. When the table is raised, the cylinder 16 rises, opening the valve 19, against the pressure of its spring 20, to admit air therein; and when the table is restored and its cylinder 16 drops, the air therein being compressed, cushions or retards its downward movement; the air being allowed to escape gradually through the small apertures 21 in valve 19.

It will be noted that while the air in the cylinder is compressed and acts as a cushion its leakage through the valve gradually restores this compressed air to atmospheric pressure and the cushion becomes dead and the whole weight of the structure is transferred from the cushion to the legs or supports. particularly important, because the weight of the table and machine is thus gradually transferred from the rollers to the legs, but the transfer is complete and the table is as firm as though no rollers had ever been used.

Since normally the wheels clear the floor or do not bear any weight of the table, the latter is maintained against movement as if it were not equipped with wheels; and whenever desired, the wheels are caused to become operative. l

Variations may be resorted to within the scope of the invention and portions may be used without others.

Havingthus described my invention, I claim: I

'1. In a stand or table, the combination with supports and wheels therefor, of means for moving said supports so that by raising said supports said wheels become 0 erative, means to maintain said supports raised and wheels 0 erative, means for gradually and complete y transferring the weight from the wheels to the supports and means for retarding the drop of said su ports when restored.

2. In a stand or table, the combination with su ports and wheels therefor, of mechanism or raising and lowering said supports to bring said wheels in and out of operative state, means for maintaining said supports raised and wheels operative, and means for retarding the drop of said supports when restored.

3. In a stand or table, the combination with supports and wheels therefor, of means for raisin and restoring said supports to bring sai wheels in and out of operative state, means for maintaining said supports raised, and a dash pot for retarding the .drop of said supports when restored.

4. In a stand or table, the combination with supports and wheels on certain of said supports, of an extensible'le a wheel thereon, a lever fastened pivotal y to the stand,

and a link connecting said lever with said leg; said lever being operated to extend and return said leg for raisin and restoring the stand to bring the whee s in aid out of operative state; said link or' lever throwing pasta dead center and abutting against a member to lock the stand in the raised position for maintaining the wheels in operative state.

5. In a stand or table, the combination with supports and wheels therefor, of a leg mounted to extend, a wheel therefor, a lever connecting said leg with the stand'for raisingand restoring said stand to bring the wheels in and out of operative state, and mechanism for retarding the drop of said stand when restored.

6. In a stand or table, the combination I deem .this feature of my device with supports and wheels therefor, of an extensible leg, a wheel thereon, levers connecting said leg with the stand for extending and returning said leg to raise and re-v store said stand to bring the wheels in and out of operative position, and a dash pot connecting the stand with said leg for retarding the drop of said stand when restored.

7. In a stand or table, the combination with supports, of a wheel or wheels fixed to the supports at one side of the stand being normally not in contact with the floor or inoperative, a leg mounted to extend, a wheel or wheels provided therefor, levers connecting said leg with the stand for raising and restoring said stand, means for maintaining the stand in raised position, and means for retardin the drop of said stand when restored; t e Stand when in raised position being tiltingly disposed so that said first wheels. are in contact with the floor and operative.

8. In a stand or table, the combination with supports, of a wheel or wheels fixed to the supports at one side of the stand being normally not in contact with the floor or inoperative, a leg mounted to extend, a wheel or wheels provided therefor, levers connecting said leg with the stand for raising and restoring said stand, means for maintaining the stand in raised position, anda dash pot connectin the stand with said leg for retarding t e drop of said stand when restored; the stand when in raised position being tiltingly disposed so that said first wheels are in contact with the floor and operative.

9. In a stand, the combination with a legv arranged to rest on the floor, 'of'a leg carrying a wheel, a slide in which said second leg moves, means for moving said leg in said slide to 'lift said stand, and means for retarding said leg as it rises.

10. In a stand, the combination with legs on which said stand normally rests, of a wheel arranged to take the load from one of said legs when said stand is tilted, another of said legs carrying a wheel, and means for extending said wheel carrying leg so that its wheel strikes the floor and tilts said stand to rest on said first-named wheel.

11. In a stand, the combination with legs on which said stand normally rests, of a wheel arranged to support said stand when the stand is tilted, a third leg carrying a wheel, means for extending said third leg so that its wheel strikes the floor and tilts said stand to rest on said-first-named wheel, and means for retarding said extended leg as it returns to normal position when said extending meansis released.

12. a stand, the combinatlon with legs on whlch it normally rests, of a lever nor mally lying close to a leg, a wheel shifted by.

said lever, other wheels to which said stand said'wheel arran edto hold said wheel and is shifted when said first Wheel is moved by lever in their shi d ositions.

said lever so that it partially supports said ALFRED F. KURUWSKI. stand, an arm on said lever arranged to Witnesses: serve as a handle when it has shifted said K FRANKFURT,

wheel, and means connecting said lever to B. ROMAN. 

